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Active graphene composite electrode material

A graphene composite and electrode material technology, applied in hybrid capacitor electrodes, battery electrodes, circuits, etc., can solve the problems of graphene performance advantages that cannot be exerted, easy to agglomerate, etc., and achieves simple preparation process, easy to scale, and multi-diffusion. Effects of Channels and Storage Spaces

Active Publication Date: 2014-05-28
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above analysis, it can be seen that the composite material composed of graphene and electrode active materials can improve the performance of battery devices, but due to the two-dimensional nanosheet structure of graphene, it is easy to reunite together, and a large part of the performance advantages of graphene can't play out

Method used

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Effect test

Embodiment 1

[0024] According to the mass percentage of 30%, the specific surface area is 2200m 2 / g of active graphene and a specific surface area of ​​1600m 2 / g of activated carbon. Put the activated graphene into the ball mill tank of the ball mill, add a small amount of ethanol and stir for 2 minutes to make the activated graphene completely wet, add activated carbon and continue to stir for 1 hour, take out the mixed material, and dry to obtain the active graphene composite electrode material. Polytetrafluoroethylene is made into pole pieces according to the mass ratio of 95:5, which is used as the electrode of the supercapacitor. Such as figure 1 , 2 shown.

Embodiment 2

[0026] Weigh graphene and rice husk ash as the precursor of activated carbon according to the mass percentage of 60%, mix evenly, infiltrate completely with deionized water, add potassium hydroxide according to the mass ratio of alkali to carbon at 1:3, stir and disperse evenly, and put it into the reaction furnace , the protective gas atmosphere is preactivated at 400°C for 1h, activated at 700°C for 1h, washed with deionized water, and dried to obtain an active graphene composite material, which is made into a pole piece with polytetrafluoroethylene at a mass ratio of 90:10, which can be used as zinc air The electrodes of the battery.

Embodiment 3

[0028]According to the mass percentage of 20%, the specific surface area is 2200m 2 / g of active graphene, put the active graphene into the ball mill tank of the ball mill, add a small amount of ethanol and stir for 3min to make the graphene completely wet, add 2% expanded graphite and stir for 30min, then add a small amount of ethanol and stir for 2min, Add activated carbon and continue stirring for 1 hour, take out the mixed material, and dry to obtain a composite electrode material, which can be used as a fuel cell electrode plate with polyvinylidene fluoride at a mass ratio of 50:50.

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Abstract

The invention relates to an active graphene composite electrode material. The active graphene composite electrode material is characterized in that active carbon particles are uniformly distributed between the surface and the sheet layer of provided or prepared active graphene; the weight percent of the active graphene in the composite electrode material is 5-90%; when the weight percent of the active graphene is lower than 30%, a third component which is not more than 10% of the total mass of the composite electrode material is added. The adopted active graphene and active carbon are of similar structures, and the active carbon can be prepared through methods of physical activation, chemical activation and physical and chemical combined activation. A porous structure of carbon is formed through gas action in the physical activation method, and a porous structure of carbon is formed through certain chemical reagent action in the chemical method, thus the specific surface area of carbon material is greatly improved. The specific surface area is greatly increased, so that more diffusion paths can be provided for ion transmission.

Description

technical field [0001] The invention relates to an active graphene composite electrode material, which belongs to new energy graphene materials. Background technique [0002] Hybrid vehicles, pure electric vehicles, fuel cell vehicles and other energy-saving and new energy vehicles are the direction of automobile development. Power battery, motor and electronic control are the three core parts. Among them, the power battery is the most restrictive factor to the development of energy saving and new energy vehicles. Currently used power batteries have low energy density, large weight and volume, short service life, high cost, narrow operating temperature range, and long charging time. In order to improve these adverse effects, people start research and development of power battery technology from material technology. [0003] Graphene is a new type of two-dimensional carbon nanomaterial, which is expected to be widely used in the field of batteries. The Chinese patent with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01M4/583C01B31/04C01B31/10C01B32/194C01B32/348
CPCY02E60/10Y02E60/13
Inventor 荣常如陈书礼韩金磊张克金林革魏晓川米新艳刘国军
Owner CHINA FIRST AUTOMOBILE
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